<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
<form method="post" action="manage_stock.php">
    <input type="text" name="product_name"/>
    <input type="number" name="year">
    <input type="number" name="number">
    <input type="submit" value="Submit">

</form>
</body>
</html>